Chen Jianglong, Gao Jinlong, Yuan Feng
Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
PLoS One. 2016 Feb 4;11(2):e0148389. doi: 10.1371/journal.pone.0148389. eCollection 2016.
Drawing upon the Landsat satellite images of Nanjing from 1985, 1995, 2001, 2007, and 2013, this paper integrates the convex hull analysis and common edge analysis at double scales, and develops a comprehensive matrix analysis to distinguish the different types of urban land expansion. The results show that Nanjing experienced rapid urban expansion, dominated by a mix of residential and manufacturing land from 1985 to 2013, which in turn has promoted Nanjing's shift from a compact mononuclear city to a polycentric one. Spatial patterns of three specific types of growth, namely infilling, extension, and enclave were quite different in four consecutive periods. These patterns result primarily from the existing topographic constraints, as well as government-oriented urban planning and policies. By intersecting the function maps, we also reveal the functional evolution of newly-developed urban land. Moreover, both self-enhancing and mutual promotion of the newly developed functions are surveyed over the last decade. Our study confirms that the integration of a multi-scale method and multi-perspective analysis, such as the spatiotemporal patterns and functional evolution, helps us to better understand the rapid urban growth in China.
本文利用1985年、1995年、2001年、2007年和2013年南京的陆地卫星图像，将凸壳分析和双尺度的公共边缘分析相结合，并开展综合矩阵分析以区分不同类型的城市土地扩张。结果表明，1985年至2013年期间南京经历了快速的城市扩张，主要以住宅和制造业用地为主，这反过来又推动了南京从紧凑型单核城市向多中心城市的转变。在连续四个时期内，三种特定增长类型（即填充、扩展和飞地）的空间格局差异很大。这些格局主要源于现有的地形限制以及政府主导的城市规划和政策。通过叠加功能地图，我们还揭示了新开发城市土地的功能演变。此外，还考察了过去十年中新开发功能的自我强化和相互促进作用。我们的研究证实，多尺度方法与多视角分析（如时空格局和功能演变）的结合有助于我们更好地理解中国城市的快速增长。
